1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.documentsui; 18 19 import android.database.AbstractCursor; 20 import android.database.Cursor; 21 import android.os.Bundle; 22 23 /** 24 * Cursor wrapper that adds columns to identify which root a document came from. 25 */ 26 public class RootCursorWrapper extends AbstractCursor { 27 private final String mAuthority; 28 private final String mRootId; 29 30 private final Cursor mCursor; 31 private final int mCount; 32 33 private final String[] mColumnNames; 34 35 private final int mAuthorityIndex; 36 private final int mRootIdIndex; 37 38 public static final String COLUMN_AUTHORITY = "android:authority"; 39 public static final String COLUMN_ROOT_ID = "android:rootId"; 40 RootCursorWrapper(String authority, String rootId, Cursor cursor, int maxCount)41 public RootCursorWrapper(String authority, String rootId, Cursor cursor, int maxCount) { 42 mAuthority = authority; 43 mRootId = rootId; 44 mCursor = cursor; 45 46 final int count = cursor.getCount(); 47 if (maxCount > 0 && count > maxCount) { 48 mCount = maxCount; 49 } else { 50 mCount = count; 51 } 52 53 if (cursor.getColumnIndex(COLUMN_AUTHORITY) != -1 54 || cursor.getColumnIndex(COLUMN_ROOT_ID) != -1) { 55 throw new IllegalArgumentException("Cursor contains internal columns!"); 56 } 57 final String[] before = cursor.getColumnNames(); 58 mColumnNames = new String[before.length + 2]; 59 System.arraycopy(before, 0, mColumnNames, 0, before.length); 60 mAuthorityIndex = before.length; 61 mRootIdIndex = before.length + 1; 62 mColumnNames[mAuthorityIndex] = COLUMN_AUTHORITY; 63 mColumnNames[mRootIdIndex] = COLUMN_ROOT_ID; 64 } 65 66 @Override getExtras()67 public Bundle getExtras() { 68 return mCursor.getExtras(); 69 } 70 71 @Override close()72 public void close() { 73 super.close(); 74 mCursor.close(); 75 } 76 77 @Override onMove(int oldPosition, int newPosition)78 public boolean onMove(int oldPosition, int newPosition) { 79 return mCursor.moveToPosition(newPosition); 80 } 81 82 @Override getColumnNames()83 public String[] getColumnNames() { 84 return mColumnNames; 85 } 86 87 @Override getCount()88 public int getCount() { 89 return mCount; 90 } 91 92 @Override getDouble(int column)93 public double getDouble(int column) { 94 return mCursor.getDouble(column); 95 } 96 97 @Override getFloat(int column)98 public float getFloat(int column) { 99 return mCursor.getFloat(column); 100 } 101 102 @Override getInt(int column)103 public int getInt(int column) { 104 return mCursor.getInt(column); 105 } 106 107 @Override getLong(int column)108 public long getLong(int column) { 109 return mCursor.getLong(column); 110 } 111 112 @Override getShort(int column)113 public short getShort(int column) { 114 return mCursor.getShort(column); 115 } 116 117 @Override getString(int column)118 public String getString(int column) { 119 if (column == mAuthorityIndex) { 120 return mAuthority; 121 } else if (column == mRootIdIndex) { 122 return mRootId; 123 } else { 124 return mCursor.getString(column); 125 } 126 } 127 128 @Override getType(int column)129 public int getType(int column) { 130 return mCursor.getType(column); 131 } 132 133 @Override isNull(int column)134 public boolean isNull(int column) { 135 return mCursor.isNull(column); 136 } 137 } 138